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Commitment and Contingencies - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Mar. 31, 2015
taxable_jurisdiction
Loss Contingencies [Line Items]  
Number of Taxable Jurisdictions 140pg_NumberofTaxableJurisdictions
Liability for Uncertain Tax Positions, Current $ 500us-gaap_LiabilityForUncertainTaxPositionsCurrent
Minimum [Member]  
Loss Contingencies [Line Items]  
Number of Audits Typically Underway 60pg_NumberofAuditsTypicallyUnderway
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Loss Contingencies [Line Items]  
Number of Audits Typically Underway 70pg_NumberofAuditsTypicallyUnderway
/ us-gaap_RangeAxis
= us-gaap_MaximumMember